#include "uart.h"

//file paths and global variables
#define incomplet_uart_path "/dev/ttyO"
struct termios options;             //The termios structure

//    *** FUNCTIONS ***

int uartConf(uint8_t uartNumber, int baudRate)
{
	char fullFileName[11];
	
	//completing uart file path
	if ((uartNumber==1)||(uartNumber==2)||(uartNumber==4)||(uartNumber==5))
		sprintf(fullFileName, incomplet_uart_path "%d", uartNumber);
	else{
		perror("Wrong UART number. " \
		"UART numbers availables 1, 2, 4 or 5.\n");
		return UART_NUMBER_INCORRECT;
	}
	
	//openign uart file
	printf("Configuring UART%d.\n", uartNumber);
	if ((uartFile[uartNumber] = open(fullFileName, O_RDWR | O_NOCTTY | O_NDELAY | O_NONBLOCK))<0){
		perror("UART: Failed to open the file.\n");
		return -1;
	}
	
	//Sets the parameters associated with file
	tcgetattr(uartFile[uartNumber], &options);
	//cleaning flags
	options.c_ispeed = 0;	options.c_lflag = 0;
	options.c_line = 0;	options.c_oflag = 0;
	options.c_ospeed = 0
	// Set up the communications options:
	options.c_cflag = baudRate | CS8 | CREAD | CLOCAL; // 8-bit, enable receiver, no modem control lines
	options.c_iflag = IGNPAR; //ignore partity errors, CR -> newline
	tcflush(uartFile[uartNumber], TCIOFLUSH); //discard file information not transmitted
	tcsetattr(uartFile[uartNumber], TCSANOW, &options); //changes occur immmediately
	printf("UART%d configurated.\n", uartNumber);
	
	return UART_FUNCTION_SUCCESSFUL;
}

int uartClose(uint8_t uartNumber)
{
    printf("Closing UART%d.\n", uartNumber);
    close(uartFile[uartNumber]);
    return UART_FUNCTION_SUCCESSFUL;
}

int uartTransmit(uint8_t uartNumber, char message[])
{
   int count;

   //writing file
   if ((count = write(uartFile[uartNumber], message, (strlen(message))))<0){        //send the string
      perror("Failed to write to the output\n");
      return -1;
   }
   tcflush(uartFile[uartNumber], TCOFLUSH);

   return UART_FUNCTION_SUCCESSFUL;
}

int uartReceive(uint8_t uartNumber)
{
    int count;

    while((count = read(uartFile[uartNumber], (void*)receive[uartNumber], 100)) < 0);
    tcflush(uartFile[uartNumber], TCIFLUSH);

    return count;
}